I'm sure it can - the real question is - will the operators of the networks allow a phone that does voip? (At least in the US)

If I wanted to track my movements I wouldn't use a phone, I would embed the accelerometer into a wristband or a belt, then bluetooth the feed to the phone for interacting with the maps. Combining this technology with belts, wrist and ankle bands could give me telepresence.

Get them to trace a U on the screen for unlock; easier, and makes more sense!